Added docs to master branch.

docs/source/models/cylinder_Ascan_2D.in

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+#title: A-scan from a metal cylinder buried in a dielectric half-space
+#domain: 0.240 0.190 0.001
+#dx_dy_dz: 0.001 0.001 0.001
+#time_window: 4e-9
+#time_step_limit_type: 2D
+#pml_cells: 10 10 0 10 10 0
+
+#material: 6 0 1 0 half_space
+
+#waveform: ricker 1 1.5e9 my_ricker
+#hertzian_dipole: z 0.100 0.170 0 my_ricker
+#rx: 0.140 0.170 0
+
+#box: 0 0 0 0.240 0.170 0.001 half_space
+#cylinder: 0.120 0.080 0 0.120 0.080 0.001 0.010 pec
+
+#geometry_view: 0 0 0 0.240 0.190 0.001 0.001 0.001 0.001 cylinder_half_space n